Method for decomposing N.sub.2 O utilizing catalysts comprising calcined anionic clay minerals
US5472677A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1995 |
| Grant date | Dec 5, 1995 |
| Priority date | — |
| Expiry date | Feb 4, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02C20/10
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention describes a highly efficient catalytic pollution control process for removing N.sub.2 O from gaseous mixtures. The process utilizes catalysts derived from anionic clay minerals, which after appropriate heat activation, provide superior N.sub.2 O decomposition activity. The catalytic process comprises contacting an N.sub.2 O-containing gaseous mixture with the decomposition catalyst under conditions sufficient to convert the N.sub.2 O into gaseous nitrogen and gaseous oxygen. The process catalysts are derived from anionic clay materials such as the hydrotalcites, sjogrenites and pyroaurites. A small but critical amount of an activator metal is provided to promote the decomposition of N.sub.2 O, particularly in wet gas steams. The activator metal may be an alkali metal such as sodium, potassium or lithium, or an alkaline-earth metal such as magnesium, with sodium giving particularly good results.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.